Led lighting device, and method of extracting light using led lighting device

Patent metadata

Field	Value
Publication number	US-2018216799-A1
Application number	US-201815923580-A
Country	US
Kind code	A1
Filing date	Mar 16, 2018
Priority date	Sep 17, 2015
Publication date	Aug 2, 2018
Grant date	—

Abstract

A frame has an outer frame made of microcellular foam resin, and two inner frames made of the microcellular foam resin. The two inner frames are arranged together inside the outer frame. Both of the inner frames and the outer frame include openings provided at respective upper portions and recess portions formed downwardly from the openings, respectively. An LED light source, which is arranged inside a light guide space, emits light with a light emitting face thereof directing toward the light guide space. Accordingly, light from the LED light source is uniformly emitted from a light extraction portion. Also, an LED light source arranged inside a light guide space emits light directing toward the light guide space. Accordingly, light from the LED light source is uniformly emitted from a light extraction portion.

First claim

1 . An LED lighting device, comprising:
an outer frame made of microcellular foam resin; and an inner frame arranged inside the outer frame and made of the microcellular foam resin, both of the inner frame and the outer frame having openings provided at respective upper portions and recess portions formed downwardly from the openings, respectively, the recess portions of the inner frame and the outer frame being spaced apart from and face each other, a surface side of the inner frame functioning as a reflector plate, a space surrounded by the surface side of the inner frame and the opening of the inner frame forming a first light guide space, a rear face side of the inner frame and a surface side of the outer frame functioning as reflector plates, respectively, a space surrounded by a rear face side of the inner frame, the surface side of the outer frame, and the openings of the inner frame and the outer frame forming a second light guide space, the opening of the inner frame serving as a first light extraction portion, an opening formed around the first light extraction portion and surrounded by the openings of the inner frame and the outer frame serving as a second light extraction portion, the opening of the inner frame being formed on a substantially same plane, the opening of the outer frame and the opening of the inner frame being formed on a same plane, or alternatively the opening of the outer frame being arranged behind the opening of the inner frame, and a first LED light source being arranged in the first light guide space and a second LED light source being arranged in the second light guide space.

2 . The LED lighting device according to claim 1 , further comprising
a light transmissive member having a first light transmissive portion and a second light transmissive portion, wherein the light transmissive member has a structure in which the first light extraction portion is covered by the first light transmissive portion and the second light extraction portion is covered by the second light extraction portion, the opening of the inner frame and the opening of the outer frame are formed on a same plane, the first light extraction portion and the second light extraction portion are formed on a same plane, a vicinity of an edge of the opening of the inner frame and a vicinity of an edge of the opening of the outer frame both contact the light transmissive member, the vicinity of the edge of the opening of the inner frame is fixed to the first light transmissive portion, and the vicinity of the edge of the opening of the outer frame is fixed to the second light transmissive portion.

3 . The LED lighting device according to claim 1 , further comprising
a light transmissive member having a first light transmissive portion and a second light transmissive portion, wherein the light transmissive member has a structure in which the first light extraction portion is covered by the first light transmissive portion and the second light extraction portion is covered by the second light extraction portion, the opening of the outer frame is arranged behind the opening of the inner frame, a vicinity of an edge of the opening of the inner frame and a vicinity of an edge of the opening of the outer frame both contact the light transmissive member, the vicinity of the edge of the opening of the inner frame is fixed to the first light transmissive portion, and the vicinity of the edge of the opening of the outer frame is fixed to the second light transmissive portion behind the first light transmissive portion.

4 . The LED lighting device according to claim 1 , wherein a front edge of the inner frame is bent in a flange shape in an outer circumferential direction of the inner frame along the first light extraction portion, and
a front edge of the outer frame is bent in a flange shape in an outer circumferential direction of the outer frame in substantially parallel to a reflector plate of a flange shape of the inner frame.

5 . The LED lighting device according to claim 1 , wherein the first LED light source is arranged on a surface side of the inner frame in the first light guide space, and the second LED light source is arranged on either a rear face side of the inner frame or a surface side of the outer frame in the second light guide space, and
the second LED light source is arranged at a position that is invisible from the second light extraction portion.

6 . The LED lighting device according to claim 1 , wherein the inner frame has one or two said recess portions, and one said first LED light source is arranged in each of the recess portions corresponding to a number of the recess portions.

7 . The LED lighting device according to claim 6 , wherein when the inner frame has one said recess portion, the first LED light source is arranged at a wall portion of the recess portion of the inner frame.

8 . The LED lighting device according to claim 6 , wherein when the inner frame has one said recess portion, the first LED light source is arranged in a substantially center of a curved face portion of the recess portion of the inner frame.

9 . The LED lighting device according to claim 6 , wherein when the inner frame has two said recess portions, the inner frame includes two independent openings provided at an upper portion thereof and the recess portions formed downwardly from the two openings, respectively, and
the first LED light sources are arranged at respective wall portions, located on a substantially same plane, of the two recess portions of the inner frame, with light emitting faces being directed in a same direction.

10 . The LED lighting device according to claim 6 , wherein when the inner frame has two said recess portions, the inner frame includes two independent openings provided at an upper portion thereof and the recess portions formed downwardly from the two openings, respectively, and
the first LED light sources are arranged at respective wall portions of the two recess portions of the inner frame, with light emitting faces being directed in an opposite direction each other.

11 . The LED lighting device according to claim 6 , wherein when the inner frame has two said recess portions, the inner frame includes two independent openings provided at an upper portion thereof and the recess portions formed downwardly from the two openings, respectively, and
the first LED light sources are arranged in substantially centers of curved face portions of the respective recess portions of the inner frame, respectively.

12 . The LED lighting device according to claim 6 , wherein at least one or more said second LED light sources are arranged in a substantially center of the second light guide space.

13 . The LED lighting device according to claim 1 , wherein shapes of the recess portions of the inner frame and the outer frame each includes: a wall portion formed downwardly and substantially perpendicular to the first light extraction portion; and any one of a curved face shape having a curved face portion opening upwardly, a substantially truncated pyramid shape, and a substantially cuboid shape.

14 . The LED lighting device according to claim 1 , wherein the outer frame is formed integrally with the inner frame, or integrated after being formed separately.

15 . The LED lighting device according to claim 1 , wherein the inner frame and the outer frame are integrated with a hinge portion, and the recess portions of both of the inner frame and the outer frame are spaced apart from each other and stacked with the hinge portion being bent.

16 . The LED lighting

Assignees

• Furukawa Electric Co Ltd
• Totoku Electric

Inventors

• Inoue Syouta
• Kubota Tetsuji
• Yamamoto Syunji
• Koaizawa Hisashi
• Kaise Tomio

Classifications

• F21V15/01 Primary

  Housings, e.g. material or assembling of housing parts (F21V15/02 takes precedence {housings forming signs or letters G09F13/04}) · CPC title

• F21S43/243

  emitting light from one or more of its extremities · CPC title

• F21V25/12

  Flameproof or explosion-proof arrangements · CPC title

• F21V3/00

  Globes; Bowls; Cover glasses (with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506) · CPC title

• F21V7/0016

  on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes · CPC title